Donna Joan Borup threw an acidic substance into the face of a Port Authority police officer during an anti-apartheid protest at JFK in 1981, the FBI claims.

At the time, Borup, a graphic designer, belonged to a Marxist-Leninist group called the May 19th Communist Organization that pushed for an armed revolution against the U.S. government, according to the FBI.

Borup failed to appear for her May 1982 trial and has been on the run ever since. She wears baggy clothes, had a photographic memory, and is considered to be quite smart.

A member of the Black Liberation Army accused of killing a state trooper "execution-style."

Joanne Deborah ChesimardFBI

Joanne Deborah Chesimard and two accomplices opened fire on state troopers during a traffic stop in May 1973, according to the FBI.

One trooper was wounded, while the other was shot dead at point-blank range.

Chesimard – a member of the Black Liberation Army – was sentenced to prison in 1977 but escaped two years later. The FBI believes she lives in Cuba.

An animal rights activist accused of arson.

Joseph Mahmoud DibeeFBI

Joseph Mahmoud Dibee attempted to destroy an energy facility and deliberately set fires as part of his activist work with the Earth Liberation Front and the Animal Liberation Front, according to the FBI.

In August 2009, The New York Times reported Dibee still had a pilot's license because the Transportation Security Administration doesn't compare the FBI's most-wanted list with the Federal Aviation Administration's list of pilots.

At the time, Dibee was trying to sell his plane on the Internet, the Times reported.

The FBI believes he fled to Syria.

A vegan woman with a light mustache who's wanted for arson.

Josephine Sunshine OverakerFBI

Like Dibee, Josephine Sunshine Overaker is accused of arson and trying to destroy an energy facility with the groups Earth Liberation Front and Animal Liberation Front.

She's a fluent Spanish speaker and vegan, and she may sport a light mustache, according to the FBI.

A possible Canadian who also allegedly broke the law in the name of the environment and animals.

Rebecca RubinFBI

Rebecca Rubin, who's believed to be Canadian, is also wanted for alleged arson connected to the Earth Liberation Front and the Animal Liberation Front.

"From 1996 to 2001, these individuals participated in a cell of approximately 20 individuals that were known as 'the family.' They conducted a range of criminal actions through the western United States in the name of the Animal Liberation Front," Michael Ward, FBI assistant director for counterterrorism, said at a press conference, referring to Rubin and others, ABC reported in 2008.

"The crimes perpetrated by ALF and ELF have proved violent and potentially deadly, as the criminals use sophisticated incendiary devices," ATF Deputy Assistant Director William McMahon reportedly said at the same press conference.

The last of the Vietnam-era radicals still on the lam.

Leo Frederick BurtFBI

Leo Frederick Burt helped bomb a University of Wisconsin building in 1970, killing a 33-year-old researcher and injuring several others, according to the FBI.